Coteau-du-Lac (French pronunciation: [kɔto dy lak]) is a small city in southwestern Quebec, Canada.

The name of the town comes from the French word coteau which means "slope" and from its location on the north shore of Lake Saint Francis.

His record stated that "Costeau du Lac is a place where one stopped on the way to the Rapides d'en Haut", referring to a small hillside (French: coteau) on the north side of the St. Lawrence River near the mouth of Lake Saint Francis (French: lac Saint-François).

These two entities merged again on 6 February 1982, to form the Municipality of Coteau-du-Lac, which changed statutes in 2007 to become a city.

[10] List of former mayors (since formation of current municipality):[14] Commission Scolaire des Trois-Lacs operates Francophone schools.